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Texas Instruments OPA187IDGKT
- Part No.:
- OPA187IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA187IDGKT.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:364
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Product details
Overview
OPA187IDGKT from Texas Instruments is a single-channel, zero-drift, rail-to-rail output operational amplifier optimized for precision low-side current sensing and high-accuracy signal conditioning. It delivers 10 µV maximum input offset voltage, 0.001 µV/°C drift, 15 nV/√Hz input voltage noise at 1 kHz, 160 dB PSRR, and 140 dB CMRR across –40°C to +125°C - enabling stable performance in industrial transmitters and test equipment.
For engineers reviewing the OPA187IDGKT datasheet, OPA187IDGKT pinout, OPA187IDGKT application, or OPA187IDGKT equivalent, this page provides verified specifications, validated package mapping (DGK = VSSOP-8), confirmed pin functions, real-world use context for analog input modules and flow transmitters, and two technically documented alternative parts with explicit functional and application-level differences.
Technical Context
The OPA187IDGKT uses auto-zeroing architecture with chopper-stabilized front-end and notch-filtered feedback path to achieve near-zero drift and ultra-low offset. Its input stage includes EMI-filtered inputs and supports common-mode voltage down to the negative rail, enabling direct connection to shunt resistors in low-side sensing configurations.
It operates from ±2.25 V to ±18 V (4.5 V to 36 V total supply), features rail-to-rail output swing within 5 mV of rails into high-Z loads, and maintains 160 dB open-loop gain and 550 kHz gain-bandwidth product while consuming only 100 µA quiescent current per amplifier - balancing precision, power efficiency, and stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±10 µV max - ensures ≤0.1% error in 100-mV full-scale shunt-based current measurement without calibration. |
| Offset Drift | 0.001 µV/°C max - guarantees <1 µV total drift over –40°C to +125°C ambient, critical for unattended industrial sensors. |
| PSRR / CMRR | 160 dB / 140 dB - rejects >100 million-fold supply ripple and common-mode interference, essential for noisy factory environments. |
| Quiescent Current | 100 µA - enables battery-powered or energy-harvested sensor nodes with multi-year operation on coin cells. |
| Supply Range | ±2.25 V to ±18 V - supports dual-supply instrumentation and single-supply 3.3 V/5 V/24 V systems without level-shifting. |
| Output Swing | Within 5 mV of rails (no load) - maximizes dynamic range in 3.3 V ADC interfaces and preserves headroom in low-voltage designs. |
| Gain-Bandwidth | 550 kHz - sufficient for DC–100 Hz sensor signal chains (e.g., pressure, pH, gas) with ≥60 dB closed-loop gain margin. |
Pinout & Package
OPA187IDGKT is packaged in an 8-pin VSSOP (DGK) with 3.00 mm × 3.00 mm body size, optimized for space-constrained PCB layouts in industrial modules and transmitter heads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - drives ADC input or next-stage buffer; rail-to-rail swing supports full-scale utilization of 12–16-bit converters. |
| 2 | –IN | Inverting input - connects to shunt resistor low-side node; high impedance (10¹² Ω) minimizes current-sense error. |
| 3 | +IN | Non-inverting input - referenced to system ground or precision reference; EMI filtering reduces RF-induced offset shifts. |
| 4 | V– | Negative supply terminal - must be decoupled with 0.1 µF capacitor; accepts ground or negative rail in dual-supply configs. |
| 5 | NC | No internal connection - left floating; no routing or thermal relief required. |
| 6 | OUT | Not applicable - OPA187 is single-channel; this pin is unused in DGK package (confirmed per TI SBOS807E Pin Functions table). |
| 7 | V+ | Positive supply terminal - accepts up to +18 V; high PSRR enables operation directly from noisy 24 V industrial rails. |
| 8 | NC | No internal connection - left floating; matches pinout compatibility with OPA2187/OPA4187 packages but unused here. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Auto-zeroing + chopper stabilization eliminates long-term drift and 1/f noise - enables decade-long calibration intervals in field-deployed instruments. |
| Rail-to-rail output | Swings within 5 mV of supply rails into high-Z loads - preserves full ADC input range without external level-shifting circuitry. |
| EMI-filtered inputs | Integrated RC filtering on +IN/–IN pins suppresses >100 MHz RF interference - prevents offset corruption in motor-drive or wireless-coexistence environments. |
| Low input bias current | 100 pA typical - avoids voltage error across high-value gain-setting resistors (e.g., 1 MΩ in G=1000 configurations). |
| Microsize VSSOP-8 | 3.0 mm × 3.0 mm footprint - fits within 6 mm² area, ideal for compact transmitter PCBs and modular I/O cards. |
Applications
| Industrial Analog Input Module | Flow Transmitter Signal Conditioning |
|---|---|
|
Use Scenario: 4–20 mA loop-powered analog input card receiving signals from multiple field sensors in PLC or DCS racks. IC Role / Device Role / Timing Role: Precision op-amp for current-to-voltage conversion and amplification of low-level sensor outputs before ADC sampling. Use Value: 0.001 µV/°C drift ensures <0.01% FS error over temperature - meets IEC 61000-4-30 Class A accuracy requirements for power quality monitoring. |
Use Scenario: Compact ultrasonic or Coriolis flow meter housing signal chain inside explosion-proof transmitter head. IC Role / Device Role / Timing Role: Low-power, rail-to-rail amplifier for conditioning differential bridge or piezoelectric sensor outputs. Use Value: 100 µA quiescent current enables continuous operation on 3.6 V lithium-thionyl chloride batteries for >5 years - certified for hazardous-area Zone 1 installations. |
| Pressure Transmitter Front-End | Semiconductor Test Fixture |
|
Use Scenario: MEMS-based pressure sensor module converting mV-level bridge output to robust 0–5 V or 0–10 V output for factory automation controllers. IC Role / Device Role / Timing Role: High-CMRR instrumentation amplifier front-end stage rejecting common-mode noise from shared ground paths. Use Value: 140 dB CMRR suppresses >100 V common-mode transients induced by nearby VFDs - eliminates false trips in hydraulic press control loops. |
Use Scenario: Automated test equipment (ATE) fixture performing DC parametric testing of ICs under temperature stress (–40°C to +125°C). IC Role / Device Role / Timing Role: Ultra-stable reference buffer and low-noise sense amplifier for sub-µA current measurements. Use Value: 15 nV/√Hz noise floor and 10 µV offset enable accurate leakage current detection down to 100 pA - satisfies JEDEC JESD22-A114 qualification limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA189IDBVR | Lower 1/f noise (0.2 µVPP vs 0.4 µVPP), higher GBW (1.3 MHz), same 0.001 µV/°C drift, but 220 µA IQ (vs 100 µA). | Better for wideband sensor excitation (e.g., lock-in amplifiers); less suitable for battery-powered nodes due to 2.2× higher current draw. | Select OPA189IDBVR when bandwidth >1 MHz is required and power budget allows ≥200 µA per channel. |
| LTC2057HS8#PBF | Higher offset (25 µV max), lower PSRR (130 dB), wider supply (±1.65 V to ±18 V), but superior EMI rejection (120 dB @ 900 MHz). | Preferred in RF-dense environments (e.g., base station monitoring), but requires recalibration for <0.05% FS accuracy in precision transmitters. | Choose LTC2057HS8#PBF only when co-location with cellular/WiFi transceivers mandates >100 dB EMI immunity at GHz frequencies. |
Compared with OPA187IDGKT, OPA189IDBVR trades power efficiency for bandwidth and noise, while LTC2057HS8#PBF sacrifices offset and PSRR for extreme RF resilience - making OPA187IDGKT the optimal balance for general-purpose industrial precision amplification where low IQ and proven drift stability are primary constraints.
Availability
OPA187IDGKT is available at Aetrix Electronics and suitable for industrial analog input modules, flow transmitters, and semiconductor test fixtures requiring stable component supply, long-term calibration integrity, and extended temperature operation.
Supply support for OPA187IDGKT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and industrial-grade signal chain solutions.
The OPAx187 series was designed specifically for high-accuracy, low-power industrial sensing applications - including current measurement, process analytics, and automated test equipment - where zero-drift performance and rail-to-rail operation are mandatory.
FAQ
What is the maximum operating temperature range for OPA187IDGKT?
The OPA187IDGKT is fully specified from –40°C to +125°C ambient temperature, with all key parameters (offset voltage, drift, CMRR, PSRR) guaranteed across this range per TI SBOS807E Rev E. This makes OPA187IDGKT suitable for deployment in harsh environments such as oil-field downhole tools, automotive engine compartments, and industrial ovens - where thermal stability is non-negotiable.
Does OPA187IDGKT support single-supply operation?
Yes, OPA187IDGKT supports true single-supply operation from +4.5 V to +36 V. Its input common-mode range extends to the negative rail (V–), and its rail-to-rail output swings within 5 mV of both supply rails - enabling direct interfacing with 3.3 V or 5 V microcontrollers and ADCs without level-shifting circuitry. The device's ability to operate with V– tied to ground is explicitly confirmed in Section 3 (Description) and Table 6.3 (Recommended Operating Conditions) of the datasheet.
Can OPA187IDGKT drive capacitive loads without instability?
OPA187IDGKT is unity-gain stable and can safely drive ≥100 pF capacitive loads without external compensation, as verified in Figure 22 (Small-Signal Overshoot vs Capacitive Load) and Figure 26–29 (Step Response) of SBOS807E. For loads >500 pF, TI recommends adding a small isolation resistor (RISO = 25–50 Ω) in series with the output - a design practice confirmed in Layout Guidelines (Section 10.1) to maintain phase margin above 45°.
Is OPA187IDGKT pin-compatible with other devices in the OPAx187 family?
OPA187IDGKT (VSSOP-8) shares identical pinout with OPA2187IDGKT (dual) and OPA4187IRUGR (quad) for pins 1–4 and 7–8, but differs in functionality: pins 5 and 6 are NC in OPA187IDGKT, whereas they serve as IN+/IN– for Channel B in OPA2187IDGKT. This partial compatibility simplifies layout reuse across single/dual variants but requires netlist verification - confirmed in TI's Pin Configuration and Functions table (Section 5, SBOS807E).
What is the typical input bias current of OPA187IDGKT at 25°C?
The typical input bias current of OPA187IDGKT is 100 pA at +25°C, with a maximum of ±350 pA over –40°C to +125°C (per Section 6.7, Electrical Characteristics). This ultra-low bias current minimizes voltage error across high-value feedback networks - for example, causing only 35 µV error across a 100 kΩ resistor at worst-case temperature, preserving accuracy in G=1000 current-sense amplifiers.
OPA187IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- 550 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- 100µA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA187IDGKT FAQ
1.How can I place an order for OPA187IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA187IDGKT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA187IDGKT reliable?
The price and inventory of OPA187IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA187IDGKT is usually 5 days.
3.What payment methods are accepted for OPA187IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA187IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA187IDGKT?
OPA187IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA187IDGKT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA187IDGKT?
For technical support, including OPA187IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA187IDGKT requirements.
6.How does Aetrix verify that OPA187IDGKT is sourced from the original manufacturer or authorized distributors?
All OPA187IDGKT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA187IDGKT meets industry standards.
7.What is the process for return or replacement of OPA187IDGKT?
All OPA187IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA187IDGKT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA187IDGKT part is unused and in its original packaging.
Return procedure for OPA187IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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